Research of the effects of calcium on microstructure and performance of geopolymer:a review
Geopolymer not only possesses the combined excellent properties of organic polymer materials,ceramic mate-rials and cement materials,but also has many advantages such as low production energy consumption and carbon emis-sions,wide raw material source,and excessive consumption of solid wastes.Therefore,it has rapidly become a research hotspot in the field of inorganic cementitious material in recent years.After introducing the calcium component into geopolymer system,the interaction processes among the main gel phases may become more complicated.Moreover,mi-crostructure and the main performance of geopolymer may be greatly affected.In this paper,we systematically review the research developments in Ca-containing geopolymer,with a particular summary and analysis on the way of introdu-cing calcium component during geopolymer preparing process,as well as the influence rule and action mechanism of cal-cium component on microstructure and performance(including setting time,compressive strength,solidification/stabili-zation of heavy metals,resistance to chemical attack,alkali-aggregate reaction,thermal stability,and resistance to efflo-rescence)of geopolymer.It would provide technical reference for performance control and application study of Ca-contai-ning geopolymer.
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